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Intangible Assets - Schedule of Intangible Assets (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Finite and Indefinite Lived Intangible Assets [Line Items]            
Intangible assets, Trade name $ 2,498   $ 2,646      
Intangible assets, gross 12,720   13,294      
Accumulated amortization (6,283)   (6,077)      
Intangible assets, net 6,437 $ 6,654 7,217 $ 7,015 $ 7,050 $ 7,625
Customer Relationships [Member]            
Finite and Indefinite Lived Intangible Assets [Line Items]            
Intangible assets, gross 5,951   6,191      
Developed Technology [Member]            
Finite and Indefinite Lived Intangible Assets [Line Items]            
Intangible assets, gross $ 4,271   $ 4,457